Funding for this research was provided by:
State Natural Sciences Foundation of China (81871372, 81501497)
Received: 13 July 2020
Accepted: 29 September 2020
First Online: 12 October 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of The Second Xiangya Hospital of Central South University in China, Xiangya Hospital of Central South University in China, and the First Affiliated Hospital of University of South China, the First People’s Hospital of Yueyang, Maternal & child health center of Changsha, Zhuzhou and Changde. Written informed consent was obtained from all of the families.
: Written informed consent was obtained from the parents for publication of clinical details and clinical images.
: The authors declare that they have no competing interests.